Add lock back to SharedRendererState

android_webview/browser/shared_renderer_state.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_
 #define ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_
 
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/synchronization/lock.h"
 #include "content/public/browser/android/synchronous_compositor.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
 
 namespace android_webview {
 
 class BrowserViewRendererClient;
 
 // Set by BrowserViewRenderer and read by HardwareRenderer.
 struct DrawGLInput {
@@ skipping 38 matching lines @@
  private:
   void ClientRequestDrawGLOnUIThread();
 
   scoped_refptr<base::MessageLoopProxy> ui_loop_;
   // TODO(boliu): Remove |client_on_ui_| from shared state.
   BrowserViewRendererClient* client_on_ui_;
   base::WeakPtrFactory<SharedRendererState> weak_factory_on_ui_thread_;
   base::WeakPtr<SharedRendererState> ui_thread_weak_ptr_;
 
   // Accessed by both UI and RT thread.
+  mutable base::Lock lock_;
   content::SynchronousCompositor* compositor_;
   DrawGLInput draw_gl_input_;
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_